超分散钴修饰多孔石墨相氮化碳光催化处理水中双酚A  

Photocatalytic degradation of BPA in water by superdispersed cobalt-modified porous graphite phase carbon nitride

作　　者：陈煌辉 陆帅帅 刘亚男 江芳[1] 陈欢[1] CHEN Huanghui;LU Shuaishuai;LIU Yanan;JIANG Fang;CHEN Huan(School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing,210094,China)

机构地区：[1]南京理工大学环境与生物工程学院,南京210094

出　　处：《环境化学》2023年第6期1992-2002,共11页Environmental Chemistry

基　　金：中央高校基本科研业务费专项资金(30920021113)资助.

摘　　要：本文通过一步热聚合法,以尿素和乙酰丙酮钴为前驱体,设计和制备了钴物种修饰的多孔石墨相氮化碳光催化剂(xCoCN).利用透射电子显微镜(TEM)、X射线衍射(XRD)、傅里叶红外光谱(FTIR)、X射线光电子能谱(XPS)、BET比表面积测试、电化学阻抗(EIS)、紫外可见漫反射(UV-vis DRS)等手段对所得xCoCN催化剂进行表征分析,并以水中双酚A(BPA)为目标污染物,考察了xCoCN的光催化活性以及pH、催化剂用量、BPA浓度等实验条件对催化性能的影响.通过活性物种捕获实验探究反应机制,实验结果表明,在模拟太阳光照射下,5CoCN用量为0.4 g·L^(−1)时,3 h内对15 mg·L^(−1)双酚A的光催化降解率达86.6%,通过活性物种捕获实验确定了空穴和超氧自由基为主要的活性物种.xCoCN光催化活性较CN有明显提升,这归因于钴物种的引入在CN表面提供了更多的活性位点,提高了电子空穴对的分离效率.In this paper,a cobalt species-modified porous graphite-phase carbon nitride photocatalyst(xCoCN)was designed and prepared by one-step thermal polymerization,using urea and acetylacetone cobalt as the precursor.The xCoCN catalysts were characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD),fourier transform infrared(FT-IR),X-ray photoelectron spectrum(XPS),BET ratio surface area test and electrochemical impedance spectroscopy(EIS).Bisphenol A(BPA)was used as the target pollutant,and the effects of the photocatalytic activity of xCoCN and pH,catalyst dosage and BPA concentration were investigated.The reaction mechanism was also explored through the active species capture experiments.The results showed that when the dosage of 5CoCN was 0.4 g·L^(−1) under simulated sunlight,the photocatalytic degradation rate of 15 mg·L^(−1) BPA reached 86.6%within 3 hours.h^(+)and·O_(2)^(-)were identified as the major active species by active species capture experiments.The enhanced photocatalytic activity of xCoCN as compared to graphitic carbon nitride(CN)is attributed to the introduction of cobalt species in the CN surface modification that provided more active sites and improved the separation efficiency of electron hole pairs.

关 键 词：石墨相氮化碳 光催化 双酚A 钴物种修饰 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]